Sant Baba Ishar Singh Jee came to take the shelter of the lotus feet of Sant Baba Nand Singh Jee only at the age of 13. From that day onwards Baba Jee was ready all the time in the service of Sant Baba Nand Singh Jee. Every one knows that Sant Baba Nand Singh Jee was always staying in the deserted places where ordinary people could not reach. But Baba Jee was always ready on duty all the times to take order from his Master and to perform whatever was asked to do and didn't care to sleep or worry about his clothes or body. Baba Jee performed an unusual service of his Master remaining barefooted most of the times. Sant Baba Nand Singh Jee sent Baba Jee to Sant Wadhawa Singh Jee of Lehra Gaga to study the scriptures. After studying the scriptures Baba Jee came back to stay under the cool shade of the lotus feet of Sant Baba Nand Singh Jee. Baba Jee became the Hazuria (Lead) Sewadar of Sant Baba Nand Singh Jee because of his love, devotion and dedication.

Sant Baba Nand Singh Jee left for the heavenly abode on 13th Badron in the Summat 2000 (August 29, 1943). Sant Baba Ishar Singh Jee was unable to comprehend the loss of his Master that he went to Dehradun and from there he came to Jhoraran. He would seldom meet anybody and tears used to drop continuously for 7 years. During this time, Nanaksar Kaleran was held by some selfish people. After a few years, Sikh Sangat (prominent followers) of various villages got together and requested Sant Baba Ishar Singh Jee to take charge of Nanaksar Kaleran. To this Baba Jee replied as and when Almighty give permission I will take charge and proceeded to Sri Hazur Sahib. Baba Jee stayed at Hazur Sahib for about one month. From there Baba Jee came back to Nanaksar Kaleran in the year 1950. Once Baba Jee reached there the Sangat started visiting Nanaksar as the real successor arrived there.

Baba Ishar Singh Jee called the Sewadars (volunteers) one day after the Bhog (completion) of morning prayers and told them to get ready to start the construction of Sarovar (pool of Holy water). They all were of the opinion that it will take at least one year to complete. Baba Jee told that he has been instructed to release the water in it on the coming Pooranmashi (Full Moon). Thus Baba Jee started its construction on 13th Haar (the last week of June). Nanaksar Sarovar was miraculously completed in record 28 days and water was released into it on the Pooranmashi. .

Once due to very heavy rainfall, the Kacha construction at Nanaksar was razed to ground. The underground Kacha rooms where Baba Nand Singh Jee used to meditate was flooded. The whole area was flooded. When the water receded, Baba Ishar Singh Jee directed that malba (debris) to be removed to lay the foundation for the sacred Gurdwara which will be known as Nanaksar Kaleran. Baba Ishar Singh Jee laid the foundation at this place on Sangrand (first day of the month) of Chet in Summat 2008. A large number of Sangat (followers) including carpenters, masons, and blacksmiths came to do the free sewa (volunteer service). Engineers and other experts came from all over to look after the design. Golden Kalas, which is 39 feet round and 13 feet high, was constructed by specially trained persons. Baba Jee fully followed the Maryada (the entire system of worship as prescribed by Sant Baba Nand Singh Jee) after coming to Nanaksar.

Baba Ishar Singh Jee not only followed the food steps of Baba Nand Singh Jee by continuing with the Kirtan and Akhand Path (continous recital) of Sri Sukhmani Sahib, but also started the Sri Sampat Akhand Paths (continous recital by reciting Mool Mantar and a special hymn at the start of each hymn) of Sri Guru Granth Sahib Jee. Baba Jee also started the Nitnem (daily ritual) of Kirtan at many other Gurdwaras situated at Jhoraran, Bhadaur, Barnala, Barundi, Samadh Bhai, Dehradun and Seerah. The most important addition was the administration of Amrit on large scale. A lot of Bihangams (Monks) started living at Nanaksar permanently and they took over the duty of Kirtan in the morning and evening. Many renowned Ragiis felt blessed by visiting Nanaksar and doing Kirtan. Baba Jee started holding the mighty large Deewan (congregation) on Pooranmashi. Many times, Baba Jee held five Deewans (congregations) in one day in different villages. Baba Jee took this mission to all over India by visiting important cities in India. Baba Jee’s directive of the administration of Amrit was a must at all the places. Baba Ishar Singh Jee became instrumental in partaking of Amrit to hundred of thousands of persons. Baba Jee always stressed the message of Sri Guru Nanak Dev Jee of Universal Brotherhood and told the people to worship Sri Guru Granth Sahib Jee as Living Divinity (Sri Guru Nanak Dev Jee) and follow its teachings in order to gain liberation from the clutches of their physical and emotional sufferings.

Baba Ishar Singh Jee visited Saproon (Shimla) in September 1963 and stayed for one night at Pinjore before proceeding to Nanaksar. Baba Jee did address the congregation in the Deewan of Pooranmashi on October 3, 1963. Baba Jee gave indication that he would have to leave for heavenly abode soon but unfortunately no one was able to believe Baba Jee’s words. On October 6, 1963 after the Ardas (prayers) of Path of Sri Rehras Sahib, Baba Ishar Singh Jee left this world and reached the house of Sri Guru Nanak Dev Jee in twinkling of an eye leaving the world weeping.

Baba Ishar Singh Jee carried out the mission of preaching the love for Sri Guru Granth Sahib Jee for 13 years and bestowed the responsibilities of continuation of the mission to Baba Gurdev Singh Jee, who at present is fulfilling those responsibilities and has been instrumental in establishing 17 new Nanaksar Gurdwaras both in India as well as abroad where millions serve and worship Sri Guru Granth Sahib Jee in the beacon light shown by the towering Light House, Baba Nand Singh Jee.